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Effects of exogenic chloride on oxidative degradation of chlorinated azo dye by UV-activated peroxodisulfate

Chinese Chemical Letters 2021年第8期32卷 2544-2550页

作者： Wenya Peng Yu Fu Lingli Wang Yifan Wang Yongxia Dong Ying Huang Zhaohui Wang Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China School of Civil and Environmental engineering Ningbo UniversityNingbo 315211China technology innovation center for land Spatial Eco-Restoration in Metropolitan Area Ministry of Natural ResourcesShanghai 200062China Shanghai engineering Research center of Biotransformation of Organic Solid Waste Shanghai 200241China Jiangsu Provincial Key Laboratory of Environmental Science and engineering Suzhou University of Science and TechnologySuzhou 215009China

Recently,the degradation of organic compounds in saline dye wastewater by sulfate radicals(SO4·-)-based advanced oxidation processes(AOPs) have attracted much ***,previous studies on these systems have selected non-chlorinated dyes as model compounds,and little is known about the transformation of chlorinated dyes in such *** this study,acid yellow 17(AY-17) was selected as a model of chlorinated contaminants,and the degradation kinetics and evolution of oxidation byproducts were investigated in the UV/PDS ***-17 can be efficiently degraded(over 98% decolorization)under 90 min irradiation at pH 2.0-3.0,and the reaction follows pseudo-first order ***-accelerated the degradation of AY-17,but simultaneously led to an undesirable increase of absorbable organic halogen(AOX).Several chlorinated byproducts were identified by liquid chromatography-mass spectrometry(LC-MS/MS) in the UV/PDS *** indicates that endogenic chlorine and exogenic Cl-reacted with SO_(4)·- to form chloride radicals,which are involved in the dechlorination and rechlorination of AY-17 and *** possible degradation mechanisms of AY-17 photooxidative degradation are *** work provides valuable information for further studies on the role of exogenic chloride in the degradation of chlorinated azo dyes and the kinetic parameters in the PDS-based oxidation process.

关键词： Sulfate radical AOX Kinetics Chlorinated byproducts

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Analysis of Jiangsu Tidal Flats Reclamation from 1974 to 2012 Using Remote Sensing

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China Ocean engineering 2015年第1期29卷 143-154页

作者：赵赛帅刘永学李满春孙超周旻曦张荷霞 Jiangsu Provincial Key Laboratory of Geographic Information Science and technology Nanjing University Collaborative innovation center for the South China Sea Studies Department of Geographic Information ScienceNanjing University Jiangsu center for Collaborative innovation in Geographical Information Resource Development and Application Nanjing University

Jiangsu has the most abundant tidal flat resources among China＇s coastal provinces. To ease the conflict between the growing population and shrinking usable land and to promote regional sustainable development, large-scale coastal reclamation development activities have been performed in Jiangsu Province since 1949. The present study has integrated multi-source remote sensing images during 1974 to 2012 by using a Multi-point Fast Marching Method （MFMM） to extract the Jiangsu coastal reclamation areas for different time periods. The temporal and spatial patterns of the extent and elevation of the reclamation areas were analysed in order to determine the unused potential for future reclamation. It will provide information necessary to support the development and construction of tidal flats in Jiangsu. Results show that：（1） the reclaimed tidal fiats along the Jiangsu coast cover more than 19.86×10^4 hm^2, of which 13.97×10^4 hm^2 is located in Yancheng, 4.84×10^4 hm^2 in Nantong, and 1.05×10^4 hm^2 in Lianyungang; （2） the average elevation of the reclaimed Jiangsu tidal flats has gradually decreased over the last 40 years, while those in Dongtai and Rudong have showed particularly accelerated decrease since the 1990s; and （3） in 2012, very few unused tidal flats two meters above the sea level are left along the Jiangsu coast, and mainly concentrated in Yancheng. As there are still reserving some coastal land resources between 0-2 m, providing us with a potential for future development. All of these findings may be useful for researchers and local authorities for the development and utilization of tidal flat resources in Jiangsu.

关键词： tidalflats remote sensing Jiangsu coast developmentpotential reclamation

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Low N apparent surplus with higher rice yield under long-term fertilizer postponing in the rice-wheat cropping system

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The Crop Journal 2022年第4期10卷 1178-1186页

作者： Yan Zhou Lei Xu Jianwei Zhang Weiwei Li Yu Jiang Songhan Wang Yanfeng Ding Zhenghui Liu Ganghua Li National engineering and technology center for Information Agriculture/Key Laboratory of Crop Physiology and Ecology in Southern China/Jiangsu Collaborative innovation center for Modern Crop Production Nanjing Agricultural UniversityNanjing 210095JiangsuChina Scientific Observing and Experimental Station of Arable land Ministry of Agriculture and Rural AffairsChina/Institute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210095JiangsuChina

Nitrogen(N)fertilization increases rice yield,but inappropriate N fertilizer application increases N loss and the risk of environmental ***-term fertilizer postponing(FP)generally reduces N apparent surplus and increases rice yields,but the effects of long-term FP on N surplus and rice yields remain *** study was the first to investigate the impacts of long-term FP(11 years)on N apparent surplus and rice *** effects in the short term(≤6 years)did not affect rice yields,whereas FP effects in the long term(>6 years)increased rice yields by 13.9%compared with conventional fertilization(CF).FP did not affect panicles per unit area,1000-kernel weight,and filled-kernel rate,but spikelets per panicle increased over time due to spikelet formation *** also reduced the N apparent surplus over time more strongly than CF owing to higher N accumulation and N utilization *** effects in the long term also significantly increased soil organic matter,total N,and NH4_(+)^(-)N *** results were supported by a pot experiment,showing that rice yields in soils with a history of FP were significantly higher than those for soils without a history of FP,indicating that FP increased rice yields more strongly in later years mainly because of soil quality *** findings suggest that longterm FP can reduce N loss while increasing rice yields by improving soil quality.

关键词： Fertilizer postponing N apparent surplus Rice yield Spikelets per panicle Rice-wheat cropping systems

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Effects of freezing intensity on soil solution nitrogen and microbial biomass nitrogen in an alpine grassland ecosystem on the Tibetan Plateau,China

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Journal of Arid land 2016年第5期8卷 749-759页

作者： YANG Zhaoping GAO Jixi YANG Meng SUN Zhizhong Jiangsu Collaborative innovation center of Atmospheric Environment and Equipment technology School of Environmental Science and EngineeringNanjing University of Information Science & Technology Nanjing Institute of Environmental Sciences Ministry of Environmental Protection State Key Laboratory of Frozen Soil engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

The change of freeze-thaw pattern of the Tibetan Plateau under climate warming is bound to have a profound impact on the soil process of alpine grassland ecosystem;however,the research on the impact of the freeze-thaw action on nitrogen processes of the alpine grassland ecosystem on the Tibetan Plateau has not yet attracted much *** this study,the impact of the freezing strength on the soil nitrogen components of alpine grassland on the Tibetan Plateau was studied through laboratory freeze-thaw simulation *** 0–10 cm topsoil was collected from the alpine marsh meadow and alpine meadow in the permafrost region of Beilu *** the experiment,the soil samples were cultivated at –10℃,–7℃,–5℃,–3℃ and –1℃,respectively for three days and then thawed at 2℃ for one *** results showed that after the freeze-thaw process,the soil microbial biomass nitrogen significantly decreased while the dissolved organic nitrogen and inorganic nitrogen significantly *** the freezing temperature was below –7℃,there was no significant difference between the content of nitrogen components,which implied a change of each nitrogen component might have a response threshold toward the freezing *** the freeze-thaw process can lead to the risk of nitrogen loss in the alpine grassland ecosystem,more attention should be paid to the response of the soil nitrogen cycle of alpine grasslands on the Tibetan Plateau to the freeze-thaw process.

关键词： freezing temperature microbial biomass nitrogen dissolved organic nitrogen inorganic nitrogen alpine grassland Tibetan Plateau

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ANALYSIS OF THE MICROPHYSICAL STRUCTURE OF RADIATION FOG IN XUANEN MOUNTAINOUS REGION OF HUBEI,CHINA

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Journal of Tropical Meteorology 2017年第2期23卷 177-190页

作者：费冬冬牛生杰杨军 Collaborative innovation center of Atmospheric Environment and Equipment technology School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044 China MCC Huatian engineering&technology Co.Ltd. Nanjing 210019 China

Based on data of radiation fog events in Xuanen, Hubei province, 2010, this paper analyzes the microphysical process and evolution characteristics of radiation fogs with complicated substrate in the upper and middle reaches of the Yangtze River, and compares them with findings in other areas. Results are as follows: radiation fog in Xuanen is evidently weaker in droplet number concentration and liquid water content than land fogs in other areas. Its liquid water content fluctuates obviously, 0.01g/m3 with visibility of 1,000 meters, which is quite different from that in urban areas, but similar to the Nanling Mountains. Bi-modal droplet distribution is likely to occur in Xuanen mountain radiation fog(MRF) events. Statistical analysis shows that the observed droplet size distribution can be piecewise described well by the Gamma distribution. There is a positive correlation between liquid water content, fog droplet concentration and mean radius, especially in the development and dissipation stage. Condensation growth and droplet evaporation are major processes of Xuanen MRF. The dissipation time coincided with the time when the grass temperature reached the peak value, which indicated that dew evaporation is a key role in maintaining Xuanen MRF. In the early stage of dense fog's growth, droplets with diameter of over 20 micrometers can be observed with visibility of800-1,000 m, which might be caused by the transportation of low cloud droplets to earth's surface by turbulence. Big droplets in the initial stage correspond to higher water content, leading to the higher observed value of water content of Xuanen MRF.

关键词： mountainous radiation fog fog microphysics upper and middle reaches of the Yangtze River

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Spatial Accessibility to Shopping Malls in Nanjing,China:Comparative Analysis with Multiple Transportation Modes

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Chinese Geographical Science 2020年第4期30卷 710-724页

作者： LI Ang CHEN Jie QIAN Tianlu ZHANG Wenhan WANG Jiechen Jiangsu Provincial Key Laboratory of Geographic Information Science and technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural ResourcesSchool of Geography and Ocean ScienceNanjing UniversityNanjing 210023China School of Architecture and Surveying engineering Datong UniversityDatong 037009China Jiangsu center for Collaborative innovation in Geographical Information Resource Development and Application Nanjing 210023China

This study attempts to evaluate the rationality of the spatial layout of shopping malls and identify the urban area with poor shopping mall accessibility,as well as to provide a reference and assist decision-making for *** the case of Nanjing,China,this study developed a method to evaluate the accessibility of shopping malls by three transport modes(car traffic,public transit,and bicycle).Specially,we divide the urban space into a regular hexagonal grid and harvest the total travel time from each of 7204 hexagon centroids to each of 129 shopping malls using the Baidu Internet *** door-to-door travel time approach is used to evaluate all travel stages(walking,waiting,transfer,and transportation)based on travel time *** further divide the shopping malls into two levels(super-regional and regional)based on the Dianping App’s information and develop the indicator of accessibility to shopping malls:the number of shopping malls within tolerance time thresholds and apply the closest facility and cumulative opportunities methods to measure accessibility *** results show that the accessibility estimations vary greatly with transport *** accessibility of shopping malls presents a concentric ring trend centered on the city center under the car traffic and bicycle *** public transit accessibility tends to axially extend due to the topology of bus routes and metro *** particular,we observe that the accessibility of shopping malls in Nanjing has an uneven spatial distribution pattern,with high accessibility values in the central urban areas and lots of underserved areas in urban fringe *** on the accessibility measurements,we finally map the poor accessibility area and propose corresponding implications for urban planning.

关键词： spatial accessibility shopping mall access transport mode door-to-door travel time internet maps

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Comparison of carbon sequestration efficiency in soil aggregates between upland and paddy soils in a red soil region of China

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Journal of Integrative Agriculture 2019年第6期18卷 1348-1359页

作者： LIU Kai-lou HUANG Jing LI Da-ming YU Xi-chu YE Hui-cai HU Hui-wen HU Zhi-hua HUANG Qing-hai ZHANG Hui-min Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable LandBeijing 100081P.R.China Jiangxi Institute of Red Soil National Engineering and Technology Research Center for Red Soil Improvement/Scientific Observational and Experimental Station of Arable Land Conservation in JiangxiMinistry of AgricultureNanchang 331717P.R.China

There is limited information on carbon sequestration efficiency(CSE)of soil aggregates in upland and paddy soils under long-term fertilization *** a red soil region of southern China,an upland soil experiment started in 1986 and a paddy soil experiment commenced in *** experiments were conducted using different fertilization *** 30 years,soil organic carbon(SOC)content and stock of different aggregate components were *** results showed that the SOC contents and stocks in upland soil were lower than in paddy *** both upland and paddy soils,the SOC contents and stocks of all aggregate components in NPKM(combined treatment with chemical nitrogen(N),phosphorus(P),potassium(K)fertilizers and manure)were the highest among all *** with CK(no fertilizer),SOC content of all aggregate components in NPKM was increased by 13.21–63.11%and 19.13–73.33%in upland and paddy soils,***,the change rates in SOC stock of all aggregate components in upland soil were lower than in paddy soil,although the change rate of SOC stock of all aggregate components in NPKM was higher than in other ***,a linear equation could fit the relationships between carbon(C)input and change rate of SOC stock(Pland soil(16.02%)was higher than that of paddy soil(15.12%)in the same climatic condition and from the same parent ***,the CSEs from all aggregates were higher than that of bulk soil,although the result from bulk soil also showed that the CSE of upland soil was higher than that of paddy soil.

关键词： CSE SOC stock soil aggregate C input long-term fertilization

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Changes in N,P and K Contents in Eum-orthic Anthrosols at Different Moisture Contents

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Asian Agricultural Research 2021年第3期13卷 35-36,51页

作者： Tingting MENG Hao DONG Shaanxi Provincial land engineering Construction Group Co. Ltd.Xi'an 710075China Institute of land engineering and technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi'an 710075China Key Laboratory of Degraded and Unused land Consolidation engineering of Ministry of Natural Resources ChinaXi'an 710075China Shaanxi Provincial land Consolidation engineering technology Research center Xi'an 710075China land engineering technology innovation center Ministry of Natural ResourcesChinaXi'an 710075China

[Objectives]This study aimed to provide a basis for the management of nitrogen,phosphorus and potassium nutrients in eum-orthic anthrosols and the fertilization of crops.[Methods]Using the indoor culture method,the contents of total nitrogen,available phosphorus and available potassium in eum-orthic anthrosols under three different moisture conditions:long-term drying,long-term logging and alternate drying and logging were analyzed and compared.[Results]The total nitrogen content was higher under the moisture condition of long-term *** minimum(0.60 g/kg)appeared on day 30,and the maximum(0.74 g/kg)appeared on day 120,increased by 8.8%compared with the *** available phosphorus content was also higher under the moisture condition of long-term *** minimum(16.9 mg/kg)appeared on day 60,and the maximum(22.5 mg/kg)appeared on day 120,increased by 33.1%compared to the *** available potassium content showed a downward trend under long-term logging,and was higher than those under the other two moisture *** maximum(150 mg/kg)appeared on day 30,and the minimum(136 mg/kg)appeared on days 75 and 90,reduced by 9.3%compared with the maximum.[Conclusions]Water plays a positive role in activating *** nutrients have different responses to different moisture conditions.

关键词： Eum-orthic anthrosols Nitrogen Phosphorus Potassium Alternate drying and logging Long-term drying Long-term logging

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Multi-scale regionalization based mining of spatio-temporal teleconnection patterns between anomalous sea and land climate events

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Journal of Central South University 2017年第10期24卷 2438-2448页

作者： XU Feng SHI Yan DENG Min GONG Jian-ya LIU Qi-liang JIN Rui Department of Geo-informatics Central South UniversityChangsha 410083China State Key Laboratory of Information engineering in Surveying(Mapping&Remote Sensing Wuhan University)Wuhan 430079China Collaborative innovation center of Geospatial technology Wuhan UniversityWuhan 430079China

Climate sequences can be applied to defining sensitive climate zones, and then the mining of spatio-temporal teleconnection patterns is useful for learning from the past and preparing for the future. However, scale-dependency in this kind of pattern is still not well handled by existing work. Therefore, in this study, the multi-scale regionalization is embedded into the spatio-temporal teleconnection pattern mining between anomalous sea and land climatic events. A modified scale-space clustering algorithm is first developed to group climate sequences into multi-scale climate zones. Then, scale variance analysis method is employed to identify climate zones at characteristic scales, indicating the main characteristics of geographical phenomena. Finally, by using the climate zones identified at characteristic scales, a time association rule mining algorithm based on sliding time windows is employed to discover spatio-temporal teleconnection patterns. Experiments on sea surface temperature, sea level pressure, land precipitation and land temperature datasets show that many patterns obtained by the multi-scale approach are coincident with prior knowledge, indicating that this method is effective and reasonable. In addition, some unknown teleconnection patterns discovered from the multi-scale approach can be further used to guide the prediction of land climate.

关键词： climate sequences anomalous climatic events spatio-temporal teleconnection patterns multi-scale regionalization

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Regularly channeled MXene membranes for ionic and molecular separation

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Frontiers of Chemical Science and engineering 2021年第3期15卷 591-594页

作者： Jingchong Liu Nü Wang Key Laboratory of Bioinspired Smart Interfacial Science and technology of Ministry of Education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China

Membrane-based separation technologies,compared with other traditional separation operations such as evaporation,extraction,precipitation and distillation,have the merits of low energy consumption,small land footprint and high efficiency and have,therefore,attracted wide attention in past decades[1,2].Laminar membranes formed by twodimensional(2D)nanosheet stacking showed high flexibility in adjusting the subnanoscale interlayer spacing to allow the unhindered transport of small ions or molecules,demonstrating high separation performance and economic applicability[3].

关键词： separation membranes distillation

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